An influential British MP has slammed Twitter for its "completely inadequate" response to questions about Russian meddling in the EU referendum last year.

Damian Collins, chair of the UK's Digital, Culture, Media, and Sport Select Committee (DCMSC), is leading an inquiry into fake news and has called on Twitter, Facebook, and Google to disclose the activity of Russian actors on their platforms during Brexit.

Twitter responded to Collins, a Conservative MP, on Wednesday, revealing that it had so far identified @RT_com — run by Kremlin-funded broadcaster RT — as the only account "which promoted referendum-related content" in the three months up to the Brexit vote.

It said RT spent $1,031.99 (£768) on six referendum-related Twitter ads during that period, all promoting the broadcaster's coverage of the vote, which took place in June last year. Twitter also shared this information with the Electoral Commission, which is investigating the issue in parallel with the DCMSC.

In a letter to Twitter CEO Jack Dorsey on Thursday, the Conservative MP said:

"The information you have now shared with us, in the form of a copy of your response to the Electoral Commission, is completely inadequate. [...]

"It seems odd that so far we have received more information about activities that have taken place on your platform from journalists and academics than from you.

"If Twitter is serious about cooperating with the work of this Committee and tackling the spread of disinformation then you should provide me with a full response to the clear questions that I set out."